Added:
- /launchguard plugins
- /launchguard plugins verbose
- /launchguard plugins dependencies
- launchguard.plugins permission
- Optional pluginInventory preflight integration in checks.yml

Plugin Inventory:
- Lists installed plugins
- Shows enabled/disabled state
- Shows plugin versions
- Shows main class, API version, authors, hard dependencies, and soft dependencies
- Reports dependency visibility without modifying plugins

Safety:
- Read-only behavior is unchanged
- LaunchGuard does not execute plugin commands
- LaunchGuard does not install, download, enable, disable, or reload plugins
- LaunchGuard does not modify worlds, blocks, economy, permissions, or whitelist state
- LaunchGuard does not send network requests

Limitations:
- Plugin inventory reports metadata, enabled state, and dependency visibility only
- It does not verify plugin configuration correctness
- It does not fully test plugin runtime behavior
- Missing hard dependencies may not appear if Paper prevents the dependent plugin from loading

Compatibility:
- Tested on Paper 1.20.4
- Java 17